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    // while(){}

    // var a=0;
    // while(a<10){
    //     console.log("我好想你")
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    // do{}while()

    // var a=0;
    // do{
    //     console.log(a);
    //     a++;
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    // do{}while()和while(){}的区别

    var a=3;
    while(a<3){
        console.log(a);
        a++;
    }

    do{
        console.log(a)
        a++;
    }while(a<3)

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